diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..a7d3ab7
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,15 @@
+name: Test
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  test:
+    runs-on: ubuntu-20.04
+
+    steps:
+      - name: Run tests
+        run: make test
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..e0d0b98
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,2 @@
+test:
+	pytest tests
diff --git a/notebooks/__init__.py b/notebooks/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/notebooks/tutorial.ipynb b/notebooks/tutorial.ipynb
index bc69451..bb83594 100644
--- a/notebooks/tutorial.ipynb
+++ b/notebooks/tutorial.ipynb
@@ -32,16 +32,17 @@
    "outputs": [],
    "source": [
     "char_aug = CharAug(\n",
-    "    unit_prob=0.3, # Процент фразы к которой будут применены аугментации\n",
-    "    min_aug=1, # Минимальное количество аугментаций\n",
-    "    max_aug=5, # Максимальное количество аугментаций\n",
-    "    mult_num=3, # Максимальное количество повторений символов (только для метода multiply)\n",
+    "    unit_prob=0.3,\n",
+    "    min_aug=1,\n",
+    "    max_aug=5,\n",
+    "    mult_num=3,\n",
     "    random_seed=42,\n",
-    "    lang=\"eng\",\n",
+    "    lang=\"rus\",\n",
     "    platform=\"pc\",\n",
     "    )\n",
     "\n",
-    "text = \"Screw you guys, I am going home. (c)\""
+    "# text = \"Screw you guys, I am going home. (c)\"\n",
+    "text = \"Привет, как дела?\""
    ]
   },
   {
@@ -56,7 +57,7 @@
     {
      "data": {
       "text/plain": [
-       "'Scorew yotu guys,u hI kam going home. (c)'"
+       "'Пнривыеут, как ждела?с'"
       ]
      },
      "execution_count": 3,
@@ -102,7 +103,7 @@
     {
      "data": {
       "text/plain": [
-       "'Screw YoU guys, I am going Home. (C)'"
+       "'ПРивЕт, каК дела?'"
       ]
      },
      "execution_count": 5,
@@ -127,7 +128,7 @@
     {
      "data": {
       "text/plain": [
-       "'Sedew you guya, I am going home. (c)'"
+       "'Пёевет, как дида?'"
       ]
      },
      "execution_count": 6,
@@ -152,7 +153,7 @@
     {
      "data": {
       "text/plain": [
-       "'Sxrew you gugs, I am going home. (x)'"
+       "'Привет, евк дела?'"
       ]
      },
      "execution_count": 7,
@@ -173,7 +174,7 @@
     {
      "data": {
       "text/plain": [
-       "'crew you guys Iam goinghme. (c)'"
+       "'Приеткк дла?'"
       ]
      },
      "execution_count": 8,
@@ -194,7 +195,7 @@
     {
      "data": {
       "text/plain": [
-       "'Screw you ughuys, I vam gcoing hxome. (c)'"
+       "'Пцриувет, кбак дьелба?'"
       ]
      },
      "execution_count": 9,
@@ -215,7 +216,7 @@
     {
      "data": {
       "text/plain": [
-       "'Screw yyou guyss, I am ggoinng home. (c)'"
+       "'Приивеет, какк дела?'"
       ]
      },
      "execution_count": 10,
@@ -236,7 +237,7 @@
     {
      "data": {
       "text/plain": [
-       "'Srcewy ou guys,I  am oging hmoe. (c)'"
+       "'рПвие,т кка длеа?'"
       ]
      },
      "execution_count": 11,
@@ -257,16 +258,16 @@
     {
      "data": {
       "text/plain": [
-       "['Screw you guyss, I am going home. (c)',\n",
-       " 'Screw eou guys, I em goifg home. (c)',\n",
+       "['Scre you guy, Iam gng home. (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
-       " 'Screw you yuys, I am goibg hone. (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
-       " 'Screw youg uys,  Iam igong hmoe. (c)',\n",
+       " 'ScRew You guys6 I Am going home. (c)',\n",
+       " 'Screwyu guys, I am goig hoe. ()',\n",
+       " 'Screw you buys, I am go9mg ho,e. (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
-       " 'Srcwe you gyus, Ia m giong home. (c)',\n",
-       " 'Screw you guys, I am going home. (c)']"
+       " 'Screw you guys, I am going home. (c)',\n",
+       " 'ScreW you guYs, I Am goIng home. (c0']"
       ]
      },
      "execution_count": 12,
@@ -280,6 +281,40 @@
     "char_aug.aug_batch(text_list, batch_prob=0.5)"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 32,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['Привет, как дела?',\n",
+       " 'Питвет, как днда?',\n",
+       " 'Пииват, ка5 дела?',\n",
+       " 'Привет, как дела?',\n",
+       " 'Привет, как дела?']"
+      ]
+     },
+     "execution_count": 32,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "text = \"Привет, как дела?\"\n",
+    "char_aug.aug_batch(\n",
+    "    batch=[text] * 5,\n",
+    "    batch_prob=0.5, \n",
+    "    action=\"typo\"\n",
+    "    )\n",
+    "\n",
+    "\n",
+    "\n",
+    "\n",
+    "\n"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 13,
@@ -289,15 +324,15 @@
      "data": {
       "text/plain": [
        "['Screw you guys, I am going home. (c)',\n",
+       " 'Screw youu guys, II am goingg home. (c)',\n",
+       " 'Scrreew you guys, I am going home. (c)',\n",
+       " 'Screww you guys, I am going home. (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
-       " 'Screw you guyss, I am goingg home. (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
-       " 'Screw you guys, II am going home. (c)',\n",
-       " 'Screw you guys, II am going hhome. (c))',\n",
        " 'Screw you guys, I am going home. (c)',\n",
-       " 'Scrrew you guys, I am goingg home. (c)',\n",
-       " 'Screw you guys, I am going home. (c)']"
+       " 'Screw you guys, I am going home. (c)',\n",
+       " 'Screw you guys, I am goinng home. (c)']"
       ]
      },
      "execution_count": 13,
@@ -335,15 +370,16 @@
    "outputs": [],
    "source": [
     "word_aug = WordAug(\n",
-    "    unit_prob=0.4, # Процент фразы к которой будут применены аугментации\n",
-    "    min_aug=1, # Минимальное количество аугментаций\n",
-    "    max_aug=5, # Максимальное количество аугментаций\n",
+    "    unit_prob=0.4,\n",
+    "    min_aug=1,\n",
+    "    max_aug=5,\n",
     "    random_seed=42,\n",
-    "    lang=\"eng\",\n",
+    "    lang=\"rus\",\n",
     "    platform=\"pc\",\n",
     "    )\n",
     "\n",
-    "text = \"Screw you guys, I am going home. (c)\""
+    "# text = \"Screw you guys, I am going home. (c)\"\n",
+    "text = \"Привет, как дела?\""
    ]
   },
   {
@@ -354,7 +390,7 @@
     {
      "data": {
       "text/plain": [
-       "'S c r e w y o u guys, I am g o i n g home. (c)'"
+       "'Привет, как д е л а ?'"
       ]
      },
      "execution_count": 16,
@@ -403,7 +439,7 @@
     {
      "data": {
       "text/plain": [
-       "'Screw to guys, I to going com. (c)'"
+       "'пркет, как дела?'"
       ]
      },
      "execution_count": 18,
@@ -424,7 +460,7 @@
     {
      "data": {
       "text/plain": [
-       "'you I am home. (c)'"
+       "'как дела?'"
       ]
      },
      "execution_count": 19,
@@ -445,7 +481,7 @@
     {
      "data": {
       "text/plain": [
-       "'Screw I guys, am home. going you (c)'"
+       "'дела? как Привет,'"
       ]
      },
      "execution_count": 20,
@@ -466,7 +502,7 @@
     {
      "data": {
       "text/plain": [
-       "'like Screw you guys, I am going completely home. by the way (c)'"
+       "'Привет, скажем как дела?'"
       ]
      },
      "execution_count": 21,
@@ -487,7 +523,7 @@
     {
      "data": {
       "text/plain": [
-       "'Screw You guys, i Am going home. (c)'"
+       "'привет, как дела?'"
       ]
      },
      "execution_count": 22,
@@ -508,7 +544,7 @@
     {
      "data": {
       "text/plain": [
-       "'Screw you guys, I am going home. (c)'"
+       "'👉, как дела?'"
       ]
      },
      "execution_count": 23,
@@ -529,7 +565,7 @@
     {
      "data": {
       "text/plain": [
-       "'Screw y o u guys, I am going h o m e . (c)'"
+       "'П р и в е т , как дела?'"
       ]
      },
      "execution_count": 24,
@@ -550,7 +586,7 @@
     {
      "data": {
       "text/plain": [
-       "'Scren you guys, I am going home. (c)'"
+       "'Привет, как дела?'"
       ]
      },
      "execution_count": 25,
@@ -572,15 +608,15 @@
      "data": {
       "text/plain": [
        "['Screw you guys, I am going home. (c)',\n",
-       " 'I am guys, Screw you going (c) home.',\n",
-       " 'Screw you am going (c)',\n",
+       " 'S c r e w you guys, I am going h o m e . ( c )',\n",
+       " 'Screw you guys, I am going home. (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
+       " 'Screw guys, am going (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
-       " 'Screw you gugs, I am going hsme. (c)',\n",
-       " 'Scerw you guys, I am going home. (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
-       " 'completely Screw you guys, I literally am going you know home. (c)']"
+       " 'Screw am I you guys, going home. (c)',\n",
+       " 'Screw you guys, I am going home. (c)']"
       ]
      },
      "execution_count": 26,
@@ -602,15 +638,15 @@
      "data": {
       "text/plain": [
        "['Screw you guys, I am going home. (c)',\n",
-       " 'screwed your guys, I am long home. (c)',\n",
+       " 'Screw you guys, I am going home. c',\n",
+       " 'Screw you guys, I am going home. (c)',\n",
+       " 'Screw you guys, I am going home. (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
-       " 'Screw you boys, im am going hoem. (c)',\n",
-       " 'Screw yo guy, to am going home. (c)',\n",
-       " 'Screw do guys, I i guig home. (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
        " 'Screw you guys, I am going home. (c)',\n",
-       " 'Screw so guys, I am going homes. wo']"
+       " 'Screw you guys, I am going home. (c)',\n",
+       " 'Screw you guys, I am going home. (c)']"
       ]
      },
      "execution_count": 27,
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_charaug.py b/tests/test_charaug.py
new file mode 100644
index 0000000..ef25623
--- /dev/null
+++ b/tests/test_charaug.py
@@ -0,0 +1,124 @@
+from augmentex import CharAug
+
+
+char_aug_rus_pc = CharAug(
+    unit_prob=0.3,
+    min_aug=1,
+    max_aug=5,
+    mult_num=3,
+    random_seed=42,
+    lang="rus",
+    platform="pc",
+)
+char_aug_rus_mobile = CharAug(
+    unit_prob=0.3,
+    min_aug=1,
+    max_aug=5,
+    mult_num=3,
+    random_seed=42,
+    lang="rus",
+    platform="mobile",
+)
+char_aug_eng_pc = CharAug(
+    unit_prob=0.3,
+    min_aug=1,
+    max_aug=5,
+    mult_num=3,
+    random_seed=42,
+    lang="eng",
+    platform="pc",
+)
+char_aug_eng_mobile = CharAug(
+    unit_prob=0.3,
+    min_aug=1,
+    max_aug=5,
+    mult_num=3,
+    random_seed=42,
+    lang="eng",
+    platform="mobile",
+)
+
+text_rus = "Привет, как дела?"
+text_eng = "I am going home."
+
+
+def test_methods() -> None:
+    assert char_aug_rus_pc.actions_list == [
+        "shift", "orfo", "typo", "delete", "multiply", "swap", "insert"]
+
+
+def test_shift() -> None:
+    assert "приВЕт, как дела?" == char_aug_rus_pc.augment(
+        text=text_rus, action="shift")
+    assert "ПРивЕт, каК дела?" == char_aug_rus_mobile.augment(
+        text=text_rus, action="shift")
+    assert "i Am gOinG home." == char_aug_eng_pc.augment(
+        text=text_eng, action="shift")
+    assert "i aM going hoMe." == char_aug_eng_mobile.augment(
+        text=text_eng, action="shift")
+
+
+def test_orfo() -> None:
+    assert "Приыет, еак дела?" == char_aug_rus_pc.augment(
+        text=text_rus, action="orfo")
+    assert "Привит, кек доло?" == char_aug_rus_mobile.augment(
+        text=text_rus, action="orfo")
+    assert "I om going hamt." == char_aug_eng_pc.augment(
+        text=text_eng, action="orfo")
+    assert "I wm aoing hope." == char_aug_eng_mobile.augment(
+        text=text_eng, action="orfo")
+
+
+def test_typo() -> None:
+    assert "Ппивет, каа деоа?" == char_aug_rus_pc.augment(
+        text=text_rus, action="typo")
+    assert "Приаео, квк днла?" == char_aug_rus_mobile.augment(
+        text=text_rus, action="typo")
+    assert "I am goijg bime." == char_aug_eng_pc.augment(
+        text=text_eng, action="typo")
+    assert "I am gpijg homw." == char_aug_eng_mobile.augment(
+        text=text_eng, action="typo")
+
+
+def test_delete() -> None:
+    assert "Првет, к дл?" == char_aug_rus_pc.augment(
+        text=text_rus, action="delete")
+    assert "ивет какдела" == char_aug_rus_mobile.augment(
+        text=text_rus, action="delete")
+    assert "Iamgong hme." == char_aug_eng_pc.augment(
+        text=text_eng, action="delete")
+    assert "Iam gng hoe." == char_aug_eng_mobile.augment(
+        text=text_eng, action="delete")
+
+
+def test_insert() -> None:
+    assert "Приветв, кщако денлъа?" == char_aug_rus_pc.augment(
+        text=text_rus, action="insert")
+    assert "Привретё, какг удела?з" == char_aug_rus_mobile.augment(
+        text=text_rus, action="insert")
+    assert "I am goinyg rhnomze." == char_aug_eng_pc.augment(
+        text=text_eng, action="insert")
+    assert "I aim goingz uhome.b" == char_aug_eng_mobile.augment(
+        text=text_eng, action="insert")
+
+
+def test_multiply() -> None:
+    assert "Привеетт, как дела?" == char_aug_rus_pc.augment(
+        text=text_rus, action="multiply")
+    assert "Привет, как деелла?" == char_aug_rus_mobile.augment(
+        text=text_rus, action="multiply")
+    assert "I am going homme." == char_aug_eng_pc.augment(
+        text=text_eng, action="multiply")
+    assert "I am going home." == char_aug_eng_mobile.augment(
+        text=text_eng, action="multiply")
+
+
+def test_swap() -> None:
+    assert "Првие, ткка деал?" == char_aug_rus_pc.augment(
+        text=text_rus, action="swap")
+    assert "Пиревт, какд лае?" == char_aug_rus_mobile.augment(
+        text=text_rus, action="swap")
+    assert "I am ginogh moe." == char_aug_eng_pc.augment(
+        text=text_eng, action="swap")
+    assert "I am ogngih ome." == char_aug_eng_mobile.augment(
+        text=text_eng, action="swap")
diff --git a/tests/test_wordaug.py b/tests/test_wordaug.py
new file mode 100644
index 0000000..aa40564
--- /dev/null
+++ b/tests/test_wordaug.py
@@ -0,0 +1,131 @@
+from augmentex import WordAug
+
+
+word_aug_rus_pc = WordAug(
+    unit_prob=0.4,
+    min_aug=1,
+    max_aug=5,
+    random_seed=42,
+    lang="rus",
+    platform="pc",
+)
+word_aug_rus_mobile = WordAug(
+    unit_prob=0.4,
+    min_aug=1,
+    max_aug=5,
+    random_seed=42,
+    lang="rus",
+    platform="mobile",
+)
+word_aug_eng_pc = WordAug(
+    unit_prob=0.4,
+    min_aug=1,
+    max_aug=5,
+    random_seed=42,
+    lang="eng",
+    platform="pc",
+)
+word_aug_eng_mobile = WordAug(
+    unit_prob=0.4,
+    min_aug=1,
+    max_aug=5,
+    random_seed=42,
+    lang="eng",
+    platform="mobile",
+)
+
+text_rus = "Привет, как дела?"
+text_eng = "I am going home."
+
+
+def test_methods() -> None:
+    assert word_aug_rus_pc.actions_list == [
+        "replace", "delete", "swap", "stopword", "reverse", "text2emoji", "split", "ngram"]
+
+
+def test_replace() -> None:
+    assert "Привет, как делло?" == word_aug_rus_pc.augment(
+        text=text_rus, action="replace")
+    assert "Привет, ккак дела?" == word_aug_rus_mobile.augment(
+        text=text_rus, action="replace")
+    assert "I am gone home." == word_aug_eng_pc.augment(
+        text=text_eng, action="replace")
+    assert "I m going home." == word_aug_eng_mobile.augment(
+        text=text_eng, action="replace")
+
+
+def test_delete() -> None:
+    assert "как дела?" == word_aug_rus_pc.augment(
+        text=text_rus, action="delete")
+    assert "Привет, как" == word_aug_rus_mobile.augment(
+        text=text_rus, action="delete")
+    assert "I am going" == word_aug_eng_pc.augment(
+        text=text_eng, action="delete")
+    assert "am going home." == word_aug_eng_mobile.augment(
+        text=text_eng, action="delete")
+
+
+def test_swap() -> None:
+    assert "как Привет, дела?" == word_aug_rus_pc.augment(
+        text=text_rus, action="swap")
+    assert "как Привет, дела?" == word_aug_rus_mobile.augment(
+        text=text_rus, action="swap")
+    assert "I am going home." == word_aug_eng_pc.augment(
+        text=text_eng, action="swap")
+    assert "I am going home." == word_aug_eng_mobile.augment(
+        text=text_eng, action="swap")
+
+
+def test_stopword() -> None:
+    assert "Привет, как в общем-то дела?" == word_aug_rus_pc.augment(
+        text=text_rus, action="stopword")
+    assert "Привет, хотя как дела?" == word_aug_rus_mobile.augment(
+        text=text_rus, action="stopword")
+    assert "totally I am going home." == word_aug_eng_pc.augment(
+        text=text_eng, action="stopword")
+    assert "I am going okay home." == word_aug_eng_mobile.augment(
+        text=text_eng, action="stopword")
+
+
+def test_reverse() -> None:
+    assert "Привет, Как дела?" == word_aug_rus_pc.augment(
+        text=text_rus, action="reverse")
+    assert "Привет, как Дела?" == word_aug_rus_mobile.augment(
+        text=text_rus, action="reverse")
+    assert "I am going Home." == word_aug_eng_pc.augment(
+        text=text_eng, action="reverse")
+    assert "I am Going home." == word_aug_eng_mobile.augment(
+        text=text_eng, action="reverse")
+
+
+def test_text2emoji() -> None:
+    assert "Привет, как дела?" == word_aug_rus_pc.augment(
+        text=text_rus, action="text2emoji")
+    assert "✋, как дела?" == word_aug_rus_mobile.augment(
+        text=text_rus, action="text2emoji")
+    assert "ℹ am going home." == word_aug_eng_pc.augment(
+        text=text_eng, action="text2emoji")
+    assert "I am going home." == word_aug_eng_mobile.augment(
+        text=text_eng, action="text2emoji")
+
+
+def test_split() -> None:
+    assert "Привет, как д е л а ?" == word_aug_rus_pc.augment(
+        text=text_rus, action="split")
+    assert "Привет, к а к дела?" == word_aug_rus_mobile.augment(
+        text=text_rus, action="split")
+    assert "I am going home." == word_aug_eng_pc.augment(
+        text=text_eng, action="split")
+    assert "I am g o i n g home." == word_aug_eng_mobile.augment(
+        text=text_eng, action="split")
+
+
+def test_ngram() -> None:
+    assert "Привет, как дела?" == word_aug_rus_pc.augment(
+        text=text_rus, action="ngram")
+    assert "Пбриет, как дела?" == word_aug_rus_mobile.augment(
+        text=text_rus, action="ngram")
+    assert "I am going hoom." == word_aug_eng_pc.augment(
+        text=text_eng, action="ngram")
+    assert "I am going home." == word_aug_eng_mobile.augment(
+        text=text_eng, action="ngram")